Good evening dear nairalander's, I need your help car gurus in the house.... I drive a Nissan Altima 2000 model, there is one day that I travelled to sango otta in ogun state and I entered a very deep flood coz rain fell so heavily that day. After getting out of the flood, I noticed the car engine started revving high once I accelerate slowly but will do normal when I'm speeding. When I got to my house, I took it to my mechanic and he said it is gear issue. I was shocked coz the gear was working perfectly well until I entered the flood. I took it to a guy who is a gear expert and after test driving, he said the gear is still okay coz it selects well aside the high revving issue. He told me that the only thing that can cause the issue is that the transmission oil filter must have been clogged after entering the flood. He now said he will have to wash the oil filter to remove clog from it and I will have to buy another transmission oil to service the gear. He said I will need 8 litres of the oil(4 litres x2). Now my question is..... Is it necessary that I must change the oil after the filter has been washed, can't he drain the oil, wash the filter and replace it back with the same oil? Secondly, do I need up to 8 litres of oil to service my transmission? I need your contributions please gurus in the house.

Just one quick question: was your check engine light on before the swim in the flood?

If truly flood water bleeped up the transmission filter, don't you think there's water in the transmission oil ?

So how you wan take dey recycle that same oil?